Two Sedans with more similarities, such as the body structure, market segment, starting price, ground shadow size, and height, than differences, like the modifications, horsepower, fuel economy, and maximum occupancy. First of all, although the 2016 Mercedes-Benz CLS-Class AMG CLS 63 S 4MATIC has a more powerful engine than the 2015 BMW M6 Gran Coupe, it gets 2 more mpg. Also, the 2015 M6 Gran Coupe seats one more passenger than the 2016 CLS-Class AMG CLS 63 S 4MATIC. Among similarities are the body structure, market segment, starting price, ground shadow size, and height.